Add `abcde`... keys choose actions

[A4-Tacks]

Is your feature request related to a problem? Please describe.

Like <Plug>(coc-codeaction-cursor) open a choose window,

Can use 1 and 2 to select items

But the number keys are not easy to press, I hope you can customize other keys

Describe the solution you'd like

Example in coc-settings.json:

{
    "xxxxxx.choose.keys": ["1a", "2b", "3c", "4d", "5", "6", "7", "8", "9"]
}

For "1a", it means using either key 1 or a to choose

Describe alternatives you've considered

None

Additional context

None